

local CSspec = "nic4"
	use "$working/CS_kl_`CSspec'", clear
	
	tempfile params
	save `params', replace

	use "$working/prowess_wits_estimation_qonly_kl.dta", clear

	generate mergeme = 1
	
	merge m:1 nic_08_4dig using `params'
	drop _merge

	tabulate nic_08_2dig, sort

	***Drop the single product firms that are non-comparable- i.e., missing energy and quantity data
	keep if q_s!=. &  energy_intensity!=.

	merge m:1 co_code1 year using "$working/first_last_years.dta"
	keep if _merge==3
	drop _merge

	sort product_id year
	xtset product_id year
	bys co_code1 year: egen nprod = count(co_code1)
	tsfill, full
	sort product_id year
	gen N = missing(L.co_code1)
	gen D = missing(f.co_code1)

	replace N = . if first_year == 1
	replace D = . if last_year == 1

	drop if missing(co_code1)

	drop cleaned_number_prod
	bysort co_code1 year: generate cleaned_number_prods = _N

	tabulate cleaned_number_prods

	gen omega_j= q_s - beta_l_hat_q * (l + ln_shares) - beta_k_hat_q* ( k + ln_shares)
	
	
	egen firm_prod = group(up12 co_code1)
	egen firm_year =  group(co_code1 year)

	ivreghdfe q_s (ln_price = omega_j), absorb(firm_prod firm_year) first cluster(co_code1)

	generate sample0 = e(sample)
	keep if sample0 == 1


	preserve
		bysort co_code1 year: generate count_thing = _n
		keep if count_thing==1
		keep co_code1 year
		save "$working/Demand_TFPQIV_CS_kl_nic4_sampleFS", replace
	restore			


	preserve
		keep co_code1 year product_name5
		isid co_code1 year product_name5
		save "$working/Demand_TFPQIV_CS_kl_nic4_sampleFS_prod", replace
	restore

	generate sigma_hat= _b[ln_price]	

	replace nic_08_2dig = "all"
	contract nic_08_2dig sigma_hat 
			
	rename _freq Observations
			
	local spec = "$spec"
	save "$working/D_TFPQIV_CS_kl_nic4", replace

	collapse (mean) sigma_hat (sum) Observations

	generate bs = 0

	save "$BS_fold/bs_D_TFPQIV_CS_kl_nic4", replace

